New arylides of 2.3-hydroxy naphthoic acid



Patented Ma 16, 1933 UNITED: STATES PATENT OFFICE ERNEST r. GRETH ANDIGERVALD IIfcoLEmAmor MIDLAND, MICHIGAN, ASSIGNOBS To run DOW CHEMICAL COMPANY, or MIDLAND, MICHIGAN, A conrom'rron or MICHIGAN NEW ARYLIDES OF 2.3-I-IYDROXY NAPHTHOIC ACID.

No Drawing.

This invention relates to new arylides of 2.3-hydroxy-naphthoic acid,useful as dyest-ufi intermediates, and distinguished from those hitherto known in that the arylides hereinafter mentioned have the general formula OONH wherein R represents an alkyl, aryl or aralkyl group. i

In our co-pending application, Serial No. 375,327, filed July 1, 1929, and entitled Azo dyestufi's from ether-arylides of amino-hy-,

' hydroxy-naphthoic acid together with the steps involved in making the same, herein after fully described and particularly pointed out in the claims, the following description setting forth certain procedure representative of the various ways In which the principle of our invention may be used.

The herein described. new arylides of 2.3- hydroxy-naphthoic acid may be prepared by condensing said acid, inthe presence of a condensing agent such as phosphorus triohloride or phosphorus pentoxide, with certain Application filed May 18, 1931.. Serial No. 538,254.

ethers of mono-hydroxy-3-amino-diphenyls having the general formula wherein one X represents hydrogen and the other X represents an alkoxy, aryloxy, or aralkoxy group.

A preferred manner in-which arylides comprising the invention may be prepared is illustrated in the specific examples given below, it being understood, however, that such examples are not to be construed as a limita tion on the invention.

E sample 1 The 2.3-hydroxy-naphthoic acid arylide of 3,-amino-4-methoxy-diphenyl is prepared by heating equimolecular quantities of said amino compound and 2.3-hydroxy-na-phthoic acid in the presence of 12 per cent of their combined weight (slightly more than 5 of a molecular equivalent) of phosphorus trichloride, under reflux and with stirring and in :the presence of sufficient toluene to permit such stirring for a period of from 3 to 5 hours.

A'slight excess of sodium carbonate over that I solution. The product so obtained is a fine, nearly white, crystalline powder having a melting point of approximately 201 C. It has probably the formula OH OCH:

OONH

Example 2 By procedure similar to that described in Example 1, 3-amino-4-ethoxy-diphenyl is condensed with 2.3-hydroxy-naphthoic acid. The product is a fine, nearly white, crystalline powder, having a melting point of approximately 210 Q, and having probably the formula OONH In a manner similar to that described above, other arylides of 2.3-hydroxy-naphthoic acid may be prepared by condensing the acid with otl er amino ethers of the present type, such as the mono-butoxy-, monophenoXy-, or mono-benzyloXy-amino-diaryls,

the arylides so formed having in common the general formula wherein one X represents hydrogen and the other X represents an alkoxy, aryloxy, or aralkoxy group;

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the relative quantities of the various materials employed, provided the ingredients stated by any of the following claims or the equiv alent of such stated ingredients be employed.

lVe therefore particularly point out and distinctly claim as our invention 1. In a process of making an arylide, the step which consists in condensing an ether of mono-hydroxy-S-amino-diphenyl, having the general formula wherein one X represents hydrogen and the other X represents an alkoxy group, with 2.3- hydroxy-naphthoic acid in the presence of phosphorus trichloride.

3. In a process of making an arylide, the

step which consists in condensing monomethoXy-3-amino-diphenyl, having the general formula wherein one X represents hydrogen and the other X represents a methoxy group, with 2.3-hydroxy-naphthoic acid in the presence of phosphorus trichloride.

4. In a process of making an arylide, the step which consists in condensing monoethoxy-S-amino-diphenyl, having the general formula wherein one X represents hydrogen and the other X represents an ethoxy group, with 2.3- hydroxy-naphthoie acid in the presence of phosphorus trichloride.

5. In a process of making an arylide, the step which consists in condensing 3-amino-4- methoxy-diphenyl with 2.3-hydroXy-naphthoic acid in the presence of phosphorus trichloride. 7

6. In a process of making an arylide, the step which consists in condensing 3-amino-6- methoXy-diphenyl with 2.3-hydroXy-naphthoic acid in the presence of phosphorus trichloride.

7. In a process of making an arylide, the step which consists in condensing 3-amino-4- ethoxy-diphenyl with 2.3-hydroxy-naphthoic acid in the presence of a phosphorus trichloride.

8. As a new compound, a 2.3-hydroxy-naphthoic acid arylide having the general formula OONH wherein one X represents hydrogen and the other X represents an alkoxy, aryl'oxy or aralkoxy group.

naphthoic acid arylide of mono-a1koxy-3- amino-diphenyl, such arylide having the general formula L I v H wherein one X represents hydrogen and the other X representsan alkoxy group.

10. As a new compound, a 2.3-hydroxynaphthoic acid arylide of mono-methoxy-3 amino-diphenyl, such arylide having the general formula r ooNn wherein one X represents hydrogen and the other X represents a methoxy group.

11. As a new compound, a 2.3-hydroxynaphthoic acid arylide of mono-ethoXy-3- amino-diphenyl, such arylide having the general formula OONH OONH

9. As a new compound, a 2,3-hydroxy- 13. As a new compound, a 2.3-hydroxy naphthoic acid arylide of 3-amin0-6-meth0xydiphenyl, said arylide having a melting point of approximately 193 C. and having prob- 5 ably the formula OONH 14:. As a new compound, a 2.3-hydroxynaphthoic acid arylide of S-aminoA-ethoxydiphenyl, said arylide having a melting point of approximately 210 C. and having probably the formula O H O ozHs Signed by us this 28 day of April, 1931.

ERNEST F. GRETHER. GERALD H. COLEMAN. 

